for-each

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return [Ember.Object.create({name: 'One'}), Ember.Object.create({name: 'Two'}), Ember.Object.create({name: 'Three'}];
  }
});

components.for-each.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInitAttrs: function() {
    var collection = this.get('collection');
    
    collection.get('lastObject').set('last', true);
    collection.get('firstObject').set('first', true);
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
{{model.length}}
{{#for-each collection=model as |item|}}
	<div>{{item.name}}</div>
  {{#if item.last}}Last!{{/if}}
{{/for-each}}

templates.components.for-each.hbs

{{#each collection as |item index|}}
	{{yield item}}
{{/each}}

twiddle.json

{
  "version": "0.4.8",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.9/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember-template-compiler.js"
  }
}